what i use is a combination of Adobe Photoshop 6.0 and Adobe Image Ready 3.0
when you load a gif into imageready you can click a button and it will open the file in adobe photoshop as a PSD file. each frame becomes a layer. then i edit the layers and when i'm done i click abutton and it sends it back to imageready.
then i can do all the gif animation stuff there. like delay time, looping. resizing what ever.
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